Additional Notes
How does a LEFT JOIN differ from an INNER JOIN in SQL?
Track: Java
Topic: SQL for Java Devs
Focus: JOINs
Java: JOINs
Answer
LEFT JOIN returns all records from the left table and matched records from the right table, filling with NULLs if no match.
LEFT JOIN is useful for getting all records from one table, even if there's no match in the other table. For example, in an e-commerce application, if you want all customers and their orders, including those with no orders, a LEFT JOIN will include customers without matching orders, showing NULL for order details. INNER JOIN would exclude such customers.
LEFT JOIN is useful for getting all records from one table, even if there's no match in the other table. For example, in an e-commerce application, if you want all customers and their orders, including those with no orders, a LEFT JOIN will include customers without matching orders, showing NULL for order details. INNER JOIN would exclude such customers.
Topics: Java JOINs SQL for Java Devs